Energy-spread measurement of triple-pulse electron beams based on the magnetic dispersion principle

TL;DR

This paper presents a method to measure the energy-spread of triple-pulse electron beams from the Dragon-II accelerator using magnetic dispersion, achieving high precision and analyzing pulse characteristics.

Contribution

It introduces a magnetic dispersion-based measurement technique for triple-pulse electron beams with detailed experimental validation.

Findings

Energy-spread less than ±2.0% for electron pulses

Effective use of a sector magnet with 300 mm radius and 90° deflection

Comparison of cavity voltage waveforms from different detectors

Abstract

The energy-spread of the triple-pulse electron beam generated by the Dragon-II linear induction accelerator is measured using the method of energy dispersion in the magnetic field. A sector magnet is applied for energy analyzing of the electron beam, which has a bending radius of 300 mm and a deflection angle of 90 degrees. For each pulse, both the time-resolved and the integral images of the electron position at the output port of the bending beam line are recorded by a streak camera and a CCD camera, respectively. Experimental results demonstrate an energy-spread of less than +-2.0% for the electron pulses. The cavity voltage waveforms obtained by different detectors are also analyzed for comparison.